source file of the GNU LilyPond music typesetter
- (c) 1997--2005 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1997--2008 Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include "performer.hh"
#include "audio-item.hh"
-#include "music.hh"
#include "duration.hh"
+#include "stream-event.hh"
+
+#include "translator.icc"
class Tempo_performer : public Performer
{
protected:
- virtual bool try_music (Music *event);
+ virtual void derived_mark () const;
void stop_translation_timestep ();
void process_music ();
-
private:
- Music *tempo_event_;
Audio_tempo *audio_;
+ SCM last_tempo_;
};
+void
+Tempo_performer::derived_mark () const
+{
+ scm_gc_mark (last_tempo_);
+}
+
Tempo_performer::Tempo_performer ()
{
- tempo_event_ = 0;
+ last_tempo_ = SCM_EOL;
audio_ = 0;
}
void
Tempo_performer::process_music ()
{
- if (tempo_event_)
+ SCM w = get_property ("tempoWholesPerMinute");
+ if (unsmob_moment (w)
+ && !ly_is_equal (w, last_tempo_))
{
- SCM met = tempo_event_->get_property ("metronome-count");
- Duration *d = unsmob_duration (tempo_event_->get_property ("tempo-unit"));
-
- Rational r = (d->get_length () / Moment (Rational (1, 4)) * Moment (scm_to_int (met))).main_part_;
+ Rational r = unsmob_moment (w)->main_part_;
+ r *= Rational (4, 1);
audio_ = new Audio_tempo (r.to_int ());
- Audio_element_info info (audio_, tempo_event_);
+ Audio_element_info info (audio_, 0);
announce_element (info);
- tempo_event_ = 0;
+
+ last_tempo_ = w;
}
}
{
if (audio_)
{
- play_element (audio_);
audio_ = 0;
}
}
-bool
-Tempo_performer::try_music (Music *event)
-{
- if (tempo_event_)
- return false;
+ADD_TRANSLATOR (Tempo_performer,
+ /* doc */
+ "",
- tempo_event_ = event;
- return true;
-}
+ /* create */
+ "",
-#include "translator.icc"
+ /* read */
+ "tempoWholesPerMinute ",
-ADD_TRANSLATOR (Tempo_performer, "", "",
- "metronome-change-event",
- "", "");
+ /* write */
+ ""
+ );